Red wool-dye.



WIIIJHEIIM IBERGDOL'I, OF LEVERKUSEN, NEAR COLOGNE, GERMANY, ASSIGNOR'TOSYNTHETIC PATENTS CO., INC., OF NEW YORK, N. Y.,A

YORK.

RED WOOL-DYE.

No Drawing. Application filed March 27, 1915, Serial No. 17,531.

Specification of Letters Patent.

CORPORATION OF NEW Renewed September 6'. 1916. Serial No.

T all whom it may concern:

Be it known that I, WILHELM Bnnenon'r', doctor of philosophy, chemist,citizen of the German Empire, residing at. Leverkusen, near Cologne,Germany, have invented new and useful Improvements in Red Wool- Dyes, ofwhich the following is a specification.

I have found that yellow-red to red azo dyestuffs for W001 can beobtained by combining in acid solution with the 2.8.6-

aminonaphthol sulfonic acid the diazocompounds of acidylizedmeta-phenylenediamin sulfonic acid compounds containing the sulfonicgroup in ortho position to the unsubstituted amino group 6. g.

SOaH

CHi-l I dOaH NH-CO-CHa The new dyes are after being dried andpulverized. dark powders soluble in water generally with a reddishcoloration; yielding upon reduction with zinc powder and acetic acid anacidylized meta-phenylene- .diaminsulfonic acid compound and1.2-diamino-8-naphthol-6-sulfonic acid. They dye wool from yellowish-redto red shades fast to light.

In order to illustrate the new process more fully the following exampleis given, the parts. being by weight: To an' aqueous solution of 25.2parts of acetyl-meta-phenylenediaminsulfonic acid and 6.9 parts ofsodium nitrite, hydrochloric acid is added The diazotation is completedafter a short time. The' until an acid mixture results.

diazo compound is then added to asolution of 24L parts of2-amino-8-naphthol-G-sulfonic acid which solution contains a slightexcess of acetic acid. After a 12 hours stirring the mixture is renderedalkaline, the dye is salted out and pressed. It is after being ,driedand pulverized a dark powder flees oi this patent may be obtained forlive cent at 1, 5i

soluble in water with a reddish coloration; ylelding upon reduction withzinc powder and acetic acid acetyl-meta-phenylenediamin sulfonic acidand 1.2-diamino-8-naphthol-6-sulfonic acid. It has in a free state mostprobably the formula:

nn co-crn and dyes wool red shades;

I claim 1. The herein described new azo dyestuffs for wool which areafter being dried and pulverized dark powders soluble in-water generallywith a reddish coloration; yielding upon reduction with zinc powder andacetic acid an acidylized meta-phenylene-- diaminsulfonic acid compoundand- 1.2- diamino-8 -naphthol-G-sulfonic acid; dyeing wool fromyellowish-red to rec shades-fast to light, substantially as described.

2. The new'azo dyestufi having in a free state most probably the formulailm-co-cm p a each, by addressing the Commissioner of Patents,

"on, D. 0."

r tenteaocemioicf

